192 SELECTED NOTES FROM 



Bleaching Fluid for Insects. 



Hydrochloric Acid - - - lo drops. 



Chlorate of Potash - - - i dr. 



Water - - - - i oz. 



Soak the object in this fluid for a day or two ; wash well. 



W. Sargent, Jun 



To Mount in Glycerine.— Heat India Rubber till it become 

 sticky, then dissolve it in Benzole, put a ring of this, both on cover 

 and slide, then let it remain till tacky; place the object in glycerine, 

 float it on if convenient, arrange it and place, and press down the 

 cover, wash away spare glycerine, and run asphalte varnish or any 

 other finish as preferred, and the slide is finished. The advantages 

 are, the India Rubber sticks in spite of the glycerine, and is elastic, 

 and so a great amount of trouble is saved. 



J. G. P. Vereker. 



To Mount Plants in Glycerine and Water. — Add to the 



glycerine first a few drops of Carbolic acid to guard against 

 fungoid growth, but do not use alcohol with the glycerine when 

 the natural colour of the plant has to be preserved. Then make 

 a mixture containing equal parts of carbohzed glycerine and 

 water ; let fall a drop or two on the slide, place the object into it, 

 and put on a covering-glass, which should not be cemented down : 

 the water will evaporate in time, and more glycerine and water 

 may be added, until the plant gets gradually filled with glycerine. 

 After this comes what used to be a tedious work — the fastening 

 dow^n of the cover-glass. This may be easily accomplished by 

 first placing a ring of gelatine round it, and to this any cement 

 will adhere. The gelatine should be prepared by pouring cold 

 water upon it, and allowing it to stand for 24 hours ; after- 

 wards pour off the water that remains unabsorbed, and heat the 

 gelatine till it dissolves, adding a few drops of Carbolic acid. 

 Each time before using the gelatine, place the bottle in a basin of 

 hot water to make it fluid. 



H. M. Klaassen. 



Sections of Teeth to Grind. — I have been recommended to 

 employ ground glass, using with it in the early stage fine ground 

 pumicestone, which is especially needed for grinding rough shells, 

 like those of Lobster or Crab. By soaking the jaw of a Mouse, 

 Rat, Weasel, etc., in a solution of Balsam in Benzole, allowing 

 it to become hard, and then grinding down as above, very 

 beautiful sections showing the teeth /;/ situ may be made. 



H. E. Freeman. 



